OPA548 datasheet(25/36 Pages) TI

25 / 36 page

www.ti.com

SIG

OPA454

V+

V-

OPA454

V-

V+

OPA454

V+

V-

OUT

=(1+2R /R )(V

V )

(1)

OPA454

V+

V-

SHUNT

OPA454

V-

V+

OPA454

V+

V-

OUT

SUPPLY

Plus

Minus

Load

=(1+2R /R

OUT

)(V

V )

(1)

(2)

OPA454

SBOS391 – DECEMBER 2007

Figure

uses

three

OPA454s

create

high-voltage instrumentation amplifier. VCM ± VSIG

must be between (V–) + 2.5V and (V+) – 2.5V. The

maximum supply voltage equals ±50V or 100V total.

Figure 75 uses three OPA454s to measure current in

a high-side shunt application. VSUPPLY must be

greater than VCM. VCM must be between (V–) + 2.5V

and (V+) – 2.5V. Adhering to these restrictions keeps

V1 and V2 within the voltage range required for linear

operation of the OPA454. For example, if V+ = 50V

and V– = 50V, then V1 = +47.5V (maximum) and

V2 = –47.5V (minimum). The maximum supply

voltage equals ±50V, or 100V total.

See Figure 76 and Figure 79 for example circuits that

use

the

OPA454

output

voltage

boost

configurations in three and six op amp output stages,

respectively.

(1) The linear input range is limited by the output swing on the

input amplifiers, A1 and A2.

Figure 74. High-Voltage Instrumentation Amplifier

(1) To increase the linear input voltage range, configure A1 and A2 as unity-gain followers.

(2) The linear input range is limited by the output swing on the input amplifiers, A1 and A2.

Figure 75. High-Voltage Instrumentation Amplifier for Measuring High-Side Shunt

Submit Documentation Feedback

Product Folder Link(s): OPA454

OPA548 Datasheet(PDF) 25 Page - Texas Instruments

OPA548 Datasheet(HTML) 25 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

Datasheet Download

Link URL